Extension-ladder



(No Model.) 3 Sheets-Sheet 1.

F. HEINE.

EXTENSION LADDER.

Patented June 28,1898.

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(No Model) 3 Sheets-Sheet 2. F. HEINE.

EXTENSION LADDER.

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(No Model.) 3 Sheets-Sheet 3.

-F. HEINE. EXTENSION LADDER.

Patented June 28, 1898.

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EXTENSION LADDER. I

SPECIFICATION forming part of Letters Patent No. 6Q6,458, dated June 28, 1898.

7 Application filed March 31, 1898. smart. 675,851. a; model.)

To all whom itvncgi concern:

Be it known that I, Fnnnnnrox HEINE, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Extension-Ladders, of' which the following is a specification.

This invention relates to improvements in extension-ladders particularly designed for firemens use.

An object of the invention is to provide a ladder to be carried on a truck and pivoted,

with improved mechanism for raising the ladder and also staying it by means of extensions at the lower end, which may be set on the ground, and by an automatically-extended brace attached to the upper sections.

The invention is illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of a truck with the ladder in position. Fig. 2 is a front elevation of the ladder, showing the three sections extended. Fig. 3 is a side elevation of the ladder, showing the upper brace or bracket extended. Fig. 4: is a cross-section through the two sliding sections. .Fig. 5 is a top plan of the turn-table. Figs. 6 and 7 are views of the winding mechanism which elevates the ladder from a horizontal to an upright position. Figs. 8 and 9 are views of the lower extensions which sit on the ground. Figs. 10 and 11 are views of the latches or levers which sustain the sections when extended.

The truck A may be of any approved construction which will allow both the front and rear wheels to swivel; A pole is to be attached to the hounds Ct. A turn-tablecomprising a fixed ring B is mounted on standards 19, at-

tached tothe truck-frame, and a movable Thev der the rigid ring and also assists to confine the revoluble ring. A crank-shaft f turns in the brackets E and carries a ratchet-wheel g and a pinion h. Above thecrank-shaft is a second shaft 1', which carries a gear-wheel j, that meshes with the pinion h. A windingdrum F is also secured rigid on the shaft t' and is rotated therewith. A chain or other flexible connection 7.". winds over the drum and has itsend connected to the bolt cl, connecting the arms D. Thus as the drum is rotated the chain draws the said arms up, and thereby elevates the ladder on its pivot or joint 0'.

A gravity-pawl Z is pivoted to the bracket 'and engages the ratchet-wheel g to hold the same in any-position: A friction brake-band G, operating the friction-band and causing it to bear on the wheel j. a

It will be seen the unattached ends of the downward-inclined arms D pass up and down through therings B 13' of the turn-table when the ladders are raised and lowered.

At the upper ends of the first and second sections are guide-plates a n, in which the second and third sections slide. I also provide longitudinal channels 0 0 on the inner side of the first and second sections and sup ply the lower ends of the second and third sections with lateral plates 19 p,which travel in the said channels.

A Windlass ll is arranged between thebars of the base-ladder and operated by a crank q, and a pawl q and ratchet-wheel (1 respectively, prevent a back movement thereof.

A rope r operates through a pulleys, fixed on the upper end of the first ladder-section O, and the end of this rope is attached to the lowermost rung of the second ladder-section C and said rope passes over the Windlass for the purpose of extending or elevating the ladder-sections. Another rope 7" has one end fastened to the upper part of the first section at a and passes through a pulley s on the upper end of the second ladder-section; and the other end of this rope r is attached to the lowermost rung of the third ladder-section O Near the top of the first ladder-section and at each side is a pivoted latch i,which engages notches formed in the lower ends of the second laddersection when elevated its full length, and these latches are held in engagement with the second section of the ladder by means of springs to. The ends 15 of the latch are bent out and a pull-rope u is attached, by which the opposite end is drawn from engagement with the ladder-section.

The lower end of the base-ladder is provided with slidable extensions consisting of two bars I, each movable in a guide on one of the side bars of the ladder and adapted to fall or extend by its own gravity, so that its projected end may rest on the ground and aid in supporting the ladder and relieving the ringturn-table of undue strain. Each sidebar of the ladder has a ratchet-bar o with teeth uppermost, the lower edge of said bars forming part of the guides in which the extension-bars I slide. A dog '0 is pivoted adjacent each extension-bar} and carried therewith and arranged to engage the teeth on the ratchet-bars '0 so as to: hold the extensionbars wherever desired. In the present instance the two extension-bars I are connected by a cross-bar and the dogs connected by another bar.

Affixed to the ends of the second ladder at each side are apertured lugs 20, to which arev pivoted link-rods w, which connect at their opposite ends with one end of a bracket J, the other end of which has eye-blocks :12, which slide on guide-rods y on the third ladder-section. As the ladder is extended the lower ends of the bracket J slide on they guide-rods. until the shoulders y are reached, after which said bracket end is carried .up and with the links, and the upper end of bracket J gradually drops away from the ladder and assumes, first an inclined position and finally a horizontal position, as shown in Fig. 3. The linkrods w sustain the other end of 'the bracket J. The bracket is thus adapted to rest against upper sections of the ladder. The bracket serves as a platform reaching from the ladder to the building, and the link-rod w will form a railing, thus allowing a safe passage on the platform. When the ladder-sections are closed up, as in Fig. 1, the bracket J and the link-rods w are extended or stretched out below the third section.

In operating the ladder the first thing is to apply a crank to the shaft f and elevate or tilt the ladder on its pivot c. The next thing is to turn the crank q and extend the ladders upward and finally set the base extensions I.

From the description here given the operation of the parts will be understood.

It is obvious that various of the details of construction may be altered without affecting the claims hereinafter made.

Having thus described my invention, what I claim is l. The combination of a truck-frame; a ring turn-table elevated on standards above the truck-frame a ladder pivoted to the movable ring of said elevated turn-table; two lifting-arms, D, each having an end attached to a different one of the side bars of the pivoted ladder and said arms inclining downward through the ring turn-table and also toward each other and their lower unattached endsjoined; a winding-drum carried by the elevated movable ring; and a chain attached to the joined ends of said lifting-arms and connected with the winding-drum, as shown and described. I

2. An extensible ladder having in combination three slidable sections; two horizontal guide-rods onthe third section; a bracket having one end pivoted and also slidable on the said rods; link-rods having one end pivoted to the upper end of the second section and their other ends jointed to said bracket; and means to extend the three sections whereby when fully extended the bracket will antomatically project in an inclined or horizontal position.

3. The combination of a truck; a turn-table mounted on the truck; a ladder pivoted to the movable member of the turn-table; mechanism to raise and lower the ladder; aratchetbar, '0 attached to the lower end of each side bar of the ladder; a slidable extensionbar, I, adjoining each ratchet-bar; and a dog or pawl, 12, carried with each extension-bar to engage the said ratchet-bar, as set forth.

In testimony whereof I afiix my signature in the presence of two witnesses.

FREDERICK HEINE.

WVitnesses:

CHAPIN A. FERGUSON, CHARLES B. MANN, Jr. 

